Squashed B200 FPGA Source. Code from Josh Blum, Ian Buckley, and Matt Ettus.

1 files changed, 185 insertions, 0 deletions

diff --git a/fpga/usrp2/gpif/gpif.v b/fpga/usrp2/gpif/gpif.v
new file mode 100644
index 000000000..e5b63d5a3
--- /dev/null
+++ b/fpga/usrp2/gpif/gpif.v
@@ -0,0 +1,185 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+//////////////////////////////////////////////////////////////////////////////////
+
+module gpif
+  #(parameter TXFIFOSIZE = 11, parameter RXFIFOSIZE = 11)
+   (// GPIF signals
+    input gpif_clk, input gpif_rst,
+    inout [15:0] gpif_d, input [3:0] gpif_ctl, output [3:0] gpif_rdy,
+    output [2:0] gpif_misc,
+    
+    // Wishbone signals
+    input wb_clk, input wb_rst,
+    output [15:0] wb_adr_o, output [15:0] wb_dat_mosi, input [15:0] wb_dat_miso,
+    output [1:0] wb_sel_o, output wb_cyc_o, output wb_stb_o, output wb_we_o, input wb_ack_i,
+    input [7:0] triggers,
+    
+    // FIFO interface
+    input fifo_clk, input fifo_rst, input clear_tx, input clear_rx,
+    output [35:0] tx_data_o, output tx_src_rdy_o, input tx_dst_rdy_i,
+    input [35:0] rx_data_i, input rx_src_rdy_i, output rx_dst_rdy_o,
+    input [35:0] tx_err_data_i, input tx_err_src_rdy_i, output tx_err_dst_rdy_o,
+    
+    output tx_underrun, output rx_overrun,
+    input [7:0] frames_per_packet,
+    output [31:0] debug0, output [31:0] debug1
+    );
+
+   assign tx_underrun = 0;
+   assign rx_overrun = 0;
+   
+   wire 	  WR = gpif_ctl[0];
+   wire 	  RD = gpif_ctl[1];
+   wire 	  OE = gpif_ctl[2];
+   wire 	  EP = gpif_ctl[3];
+
+   wire 	  CF, CE, DF, DE;
+   
+   assign gpif_rdy = { CF, CE, DF, DE };
+   
+   wire [15:0] 	  gpif_d_out;
+   assign gpif_d = OE ? gpif_d_out : 16'bz;
+
+   wire [15:0] 	  gpif_d_copy = gpif_d;
+
+   wire [31:0] 	  debug_rd, debug_wr, debug_split0, debug_split1;
+   
+   // ////////////////////////////////////////////////////////////////////
+   // TX Data Path
+
+   wire [18:0] 	  tx19_data;
+   wire 	  tx19_src_rdy, tx19_dst_rdy;
+   wire [35:0] 	  tx36_data;
+   wire 	  tx36_src_rdy, tx36_dst_rdy;
+
+   wire [18:0] 	  ctrl_data;
+   wire 	  ctrl_src_rdy, ctrl_dst_rdy;
+   
+   gpif_wr gpif_wr
+     (.gpif_clk(gpif_clk), .gpif_rst(gpif_rst), 
+      .gpif_data(gpif_d), .gpif_wr(WR), .gpif_ep(EP),
+      .gpif_full_d(DF), .gpif_full_c(CF),
+      
+      .sys_clk(fifo_clk), .sys_rst(fifo_rst),
+      .data_o(tx19_data), .src_rdy_o(tx19_src_rdy), .dst_rdy_i(tx19_dst_rdy),
+      .ctrl_o(ctrl_data), .ctrl_src_rdy_o(ctrl_src_rdy), .ctrl_dst_rdy_i(ctrl_dst_rdy),
+      .debug(debug_wr) );
+
+   // join vita packets which are longer than one frame, drop frame padding
+   wire [18:0] 	  refr_data;
+   wire 	  refr_src_rdy, refr_dst_rdy;
+   
+   packet_reframer tx_packet_reframer 
+     (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+      .data_i(tx19_data), .src_rdy_i(tx19_src_rdy), .dst_rdy_o(tx19_dst_rdy),
+      .data_o(refr_data), .src_rdy_o(refr_src_rdy), .dst_rdy_i(refr_dst_rdy));
+
+   fifo19_to_fifo36 #(.LE(1)) f19_to_f36
+     (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
+      .f19_datain(refr_data), .f19_src_rdy_i(refr_src_rdy), .f19_dst_rdy_o(refr_dst_rdy),
+      .f36_dataout(tx36_data), .f36_src_rdy_o(tx36_src_rdy), .f36_dst_rdy_i(tx36_dst_rdy));
+   
+   fifo_cascade #(.WIDTH(36), .SIZE(TXFIFOSIZE)) tx_fifo36
+     (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+      .datain(tx36_data), .src_rdy_i(tx36_src_rdy), .dst_rdy_o(tx36_dst_rdy),
+      .dataout(tx_data_o), .src_rdy_o(tx_src_rdy_o), .dst_rdy_i(tx_dst_rdy_i));
+
+   // ////////////////////////////////////////////
+   // RX Data Path
+
+   wire [35:0] 	  rx36_data;
+   wire 	  rx36_src_rdy, rx36_dst_rdy;
+   wire [18:0] 	  rx19_data, splt_data;
+   wire 	  rx19_src_rdy, rx19_dst_rdy, splt_src_rdy, splt_dst_rdy;
+   wire [18:0] 	  resp_data, resp_int1, resp_int2;
+   wire 	  resp_src_rdy, resp_dst_rdy;
+   wire 	  resp_src_rdy_int1, resp_dst_rdy_int1, resp_src_rdy_int2, resp_dst_rdy_int2;
+   
+   fifo_cascade #(.WIDTH(36), .SIZE(RXFIFOSIZE)) rx_fifo36
+     (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+      .datain(rx_data_i), .src_rdy_i(rx_src_rdy_i), .dst_rdy_o(rx_dst_rdy_o),
+      .dataout(rx36_data), .src_rdy_o(rx36_src_rdy), .dst_rdy_i(rx36_dst_rdy));
+
+   fifo36_to_fifo19 #(.LE(1)) f36_to_f19
+     (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+      .f36_datain(rx36_data), .f36_src_rdy_i(rx36_src_rdy), .f36_dst_rdy_o(rx36_dst_rdy),
+      .f19_dataout(rx19_data), .f19_src_rdy_o(rx19_src_rdy), .f19_dst_rdy_i(rx19_dst_rdy) );
+
+   packet_splitter #(.FRAME_LEN(256)) packet_splitter
+     (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+      .frames_per_packet(frames_per_packet),
+      .data_i(rx19_data), .src_rdy_i(rx19_src_rdy), .dst_rdy_o(rx19_dst_rdy),
+      .data_o(splt_data), .src_rdy_o(splt_src_rdy), .dst_rdy_i(splt_dst_rdy),
+      .debug0(debug_split0), .debug1(debug_split1));
+     
+   gpif_rd gpif_rd
+     (.gpif_clk(gpif_clk), .gpif_rst(gpif_rst),
+      .gpif_data(gpif_d_out), .gpif_rd(RD), .gpif_ep(EP),
+      .gpif_empty_d(DE), .gpif_empty_c(CE), .gpif_flush(gpif_misc[0]),
+      
+      .sys_clk(fifo_clk), .sys_rst(fifo_rst),
+      .data_i(splt_data), .src_rdy_i(splt_src_rdy), .dst_rdy_o(splt_dst_rdy),
+      .resp_i(resp_data), .resp_src_rdy_i(resp_src_rdy), .resp_dst_rdy_o(resp_dst_rdy),
+      .debug(debug_rd) );
+
+   // ////////////////////////////////////////////////////////////////////
+   // FIFO to Wishbone interface
+
+   fifo_to_wb fifo_to_wb
+     (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
+      .data_i(ctrl_data), .src_rdy_i(ctrl_src_rdy), .dst_rdy_o(ctrl_dst_rdy),
+      .data_o(resp_int1), .src_rdy_o(resp_src_rdy_int1), .dst_rdy_i(resp_dst_rdy_int1),
+      .wb_adr_o(wb_adr_o), .wb_dat_mosi(wb_dat_mosi), .wb_dat_miso(wb_dat_miso), .wb_sel_o(wb_sel_o), 
+      .wb_cyc_o(wb_cyc_o), .wb_stb_o(wb_stb_o), .wb_we_o(wb_we_o), .wb_ack_i(wb_ack_i),
+      .triggers(triggers),
+      .debug0(), .debug1());
+
+   wire [18:0] 	  tx_err19_data;
+   wire 	  tx_err19_src_rdy, tx_err19_dst_rdy;
+   
+   fifo36_to_fifo19 #(.LE(1)) f36_to_f19_txerr
+     (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+      .f36_datain(tx_err_data_i), .f36_src_rdy_i(tx_err_src_rdy_i), .f36_dst_rdy_o(tx_err_dst_rdy_o),
+      .f19_dataout(tx_err19_data), .f19_src_rdy_o(tx_err19_src_rdy), .f19_dst_rdy_i(tx_err19_dst_rdy) );
+
+   fifo19_mux #(.prio(0)) mux_err_stream
+     (.clk(wb_clk), .reset(wb_rst), .clear(0),
+      .data0_i(resp_int1), .src0_rdy_i(resp_src_rdy_int1), .dst0_rdy_o(resp_dst_rdy_int1),
+      .data1_i(tx_err19_data), .src1_rdy_i(tx_err19_src_rdy), .dst1_rdy_o(tx_err19_dst_rdy),
+      .data_o(resp_int2), .src_rdy_o(resp_src_rdy_int2), .dst_rdy_i(resp_dst_rdy_int2));
+									
+   fifo19_pad #(.LENGTH(16)) fifo19_pad
+     (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
+      .data_i(resp_int2), .src_rdy_i(resp_src_rdy_int2), .dst_rdy_o(resp_dst_rdy_int2),
+      .data_o(resp_data), .src_rdy_o(resp_src_rdy), .dst_rdy_i(resp_dst_rdy));
+        
+   // ////////////////////////////////////////////
+   //    DEBUG
+   
+   //assign debug0 = { rx19_src_rdy, rx19_dst_rdy, resp_src_rdy, resp_dst_rdy, gpif_ctl[3:0], gpif_rdy[3:0], 
+	//	     gpif_d_copy[15:0] };
+   
+   //assign debug1 = { { debug_rd[15:8] },
+	//	     { debug_rd[7:0] },
+		//     { rx_src_rdy_i, rx_dst_rdy_o, rx36_src_rdy, rx36_dst_rdy, rx19_src_rdy, rx19_dst_rdy, resp_src_rdy, resp_dst_rdy},
+		  //   { tx_src_rdy_o, tx_dst_rdy_i, tx19_src_rdy, tx19_dst_rdy, tx36_src_rdy, tx36_dst_rdy, ctrl_src_rdy, ctrl_dst_rdy} };
+   
+   assign debug0 = { gpif_ctl[3:0], gpif_rdy[3:0], debug_split0[23:0] };
+   assign debug1 = { gpif_misc[0], debug_rd[14:0], debug_split1[15:8], debug_split1[7:0] };
+endmodule // gpif